Crankshaft Inspection

WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Important: Use care when handling the crankshaft. Avoid damage to the bearing surfaces.

Clean the crankshaft in solvent. Remove all sludge or restrictions from the oil passages.
CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
Dry the crankshaft and bearings with compressed air.

Fig 1: Crankshaft
Courtesy of GENERAL MOTORS CORP.
Inspect the crankshaft for the following conditions:
- Crankshaft journals (1) should be smooth with no evidence of scoring or damage
- Deep grooves (2)
- Scratches or uneven wear (3)
- Pitted surfaces (4)
- Wear or damage to the thrust journal surfaces
- Scoring or damage to the rear seal surface
- Restrictions to oil passages
- Damage to threaded bolt holes
Fig 2: Crankshaft Inspection Areas
Courtesy of GENERAL MOTORS CORP.

Important: The crankshaft pin is a pressed in roll pin. The pin only needs to be removed from the crankshaft if the pin is damaged.
Inspect the crankshaft pin for damage:
- Measure for proper installed height (A). Correct height should be 2.00-2.25 mm (0.078-0.088 in).
- Replace the crankshaft pin if it is damaged.
Fig 3: Measuring Crankshaft Pin
Courtesy of GENERAL MOTORS CORP.

Important: Do NOT attempt to remove the crankshaft reluctor wheels. If the reluctor wheels are damaged and/or removed, the crankshaft must be replaced.
Inspect the reluctor wheels for cracked, bent or broken teeth.
- Measure between the crankshaft shoulder and the front reluctor wheel (1).
- Measure between the front and rear reluctor wheels (2).
- The maximum allowable gap is 0.15 mm (0.006 in).
Fig 4: Inspecting Reluctor Wheels
Courtesy of GENERAL MOTORS CORP.
Measure the crankshaft main journals and the crankpins for out-of-round and taper.

Fig 5: Measuring Crankshaft Main Journals
Courtesy of GENERAL MOTORS CORP.
Using a suitable fixture, support the crankshaft.
1. 7.1. Measure the crankshaft runout using J 7872 .
2. 7.2. Crankshaft runout should not exceed 0.051 mm (0.002 in).
Fig 6: Measuring Crankshaft Runout
Courtesy of GENERAL MOTORS CORP.
Inspect the crankshaft thrust wall surface for wear (1) and/or excessive runout (2). Refer to Engine Mechanical Specifications .

Fig 7: Inspecting Crankshaft Thrust Wall Surface
Courtesy of GENERAL MOTORS CORP.